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The Short-Hard GRB 051103: Observations and Implications for Its Nature

Ofek, E. O. and Kulkarni, S. R. and Nakar, E. and Cenko, S. B. and Cameron, P. B. and Frail, D. A. and Gal-Yam, A. and Soderberg, A. M. and Fox, D. B. (2006) The Short-Hard GRB 051103: Observations and Implications for Its Nature. Astrophysical Journal, 652 (1). pp. 507-511. ISSN 0004-637X. doi:10.1086/507837.

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The bright short-hard GRB 051103 was triangulated by the Inter-Planetary Network and found to occur in the direction of the nearby M81/M82 galaxy group. Given its possible local-universe nature, we searched for an afterglow associated with this burst. We observed the entire 3 σ error quadrilateral using the Palomar 60 inch robotic telescope and the Very Large Array (VLA) about 3 days after the burst. We used the optical and radio observations to constrain the flux of any afterglow related to this burst and to show that this burst is not associated with a typical supernova out to z ≈ 0.15. Our optical and radio observations, along with the Konus/Wind gamma-ray energy and light curve, are consistent with this burst being a giant flare of a soft gamma-ray repeater (SGR) within the M81 galaxy group. Furthermore, we find a star-forming region associated with M81 within the error quadrilateral of this burst, which supports the SGR hypothesis. If confirmed, this will be the first case of a soft gamma-ray repeater outside the Local Group.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ofek, E. O.0000-0002-6786-8774
Kulkarni, S. R.0000-0001-5390-8563
Nakar, E.0000-0002-4534-7089
Cenko, S. B.0000-0003-1673-970X
Gal-Yam, A.0000-0002-3653-5598
Fox, D. B.0000-0002-3714-672X
Additional Information:© 2006. The American Astronomical Society. Received 2006 May 9; accepted 2006 July 19. This work is supported in part by grants from NSF and NASA. We are grateful to an anonymous referee for his useful comments.
Funding AgencyGrant Number
Subject Keywords:gamma ray bursts; M81; M82; neutron stars
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Record Number:CaltechAUTHORS:OFEapj06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11411
Deposited By: Archive Administrator
Deposited On:13 Aug 2008 18:03
Last Modified:08 Nov 2021 21:58

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